Help for an project

Hello, I make an game which will be on steam in the future.

I have 2 questions

Q1:How to make parts that can be assembled / disassembled on cars in unity/blender

Q2:Where can i find UnityCar Pro 2.2 or 2.1
(I need unitycar because it is much better than other assets, such as realistic car controller, etc.)
Sorry for my English

Game information:
Unity 5.6
Blender 2.78
Playmaker

UnityCar is deprecated, but its author is active here on the forum, so I’d start by just asking if they will still sell it to you.

Ok

Be aware that if you choose a release that old you’re going to find a lot of what was once supported is no longer there. You’re already seeing it with the deprecation of UnityCar but there are a lot of other assets that started in the Unity 5.6 era that are still available that will no longer support 5.6.